mash: Replace ShelfItemDelegate::CanPin with ShelfItem::pinned_by_policy.

ash/common/shelf/shelf_window_watcher_item_delegate.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/shelf/shelf_window_watcher_item_delegate.h"
 
 #include "ash/common/shelf/shelf_controller.h"
 #include "ash/common/shelf/shelf_model.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
@@ skipping 46 matching lines @@
 
 base::string16 ShelfWindowWatcherItemDelegate::GetTitle() {
   return window_->GetTitle();
 }
 
 ShelfMenuModel* ShelfWindowWatcherItemDelegate::CreateApplicationMenu(
     int event_flags) {
   return nullptr;
 }
 
-bool ShelfWindowWatcherItemDelegate::CanPin() const {
-  return GetShelfItemType(id_) != TYPE_APP_PANEL;
-}
-
 void ShelfWindowWatcherItemDelegate::Close() {
   window_->CloseWidget();
 }
 
 }  // namespace ash